Like father, like son.

Will Ferrell went on "Late Show with David Letterman" last night to promote his upcoming political spoof "The Campaign," and shared with Dave an annoying habit his two-year-old son, Axel, has picked up.

"He thinks it's hilarious to walk up to anyone, male or female, and say, 'You have a little penis,'" Ferrell said.

But the "Anchorman" star thinks he can turn that embarrassing little tic into something that could make everyone -- or at least Ferrell -- laugh.

"My brother-in-law wants me to have a big, fancy Hollywood party and invite a bunch of actors," he said. "Hopefully have him walk up to a George Clooney type and say, 'You have a little penis.'"

"Like George Clooney hasn't heard that before!" Letterman responded, for some reason. Maybe he knows something we don't?

Ferrell's youngest child seems destined to continue his jokester ways throughout his life. Ferrell's wife Viveca gave birth to Axel only hours after she appeared alongside Will on the final episode of "The Tonight Show with Conan O'Brien."

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